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Zuckerberg comes back from break with a correction on his previous answer as to why Facebook didn't kick Cambridge Analytica off its platform. He said that his team told him that Cambridge Analytica was on the platform as an advertiser in 2015, contrary to his initial answer.

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Four hours and 54 minutes after he began testifying, Zuckerberg is done. He was contrite, and he neither agreed to nor objected to most of the senators’ suggestions, pet bills and light condemnations. As many senators noted, regulation could actually be a good thing for Facebook — as could a lack of new regulation. But all in all, Zuckerberg emerged unscathed.

Zuckerberg's notes during the hearing included talking points around how to defend Facebook, election integrity, and, of course, Cambridge Analytica.

An aide to Facebook CEO Mark Zuckerberg closes a binder of notes left on the table as Zuckerberg takes a short break from testifying before a joint hearing of the Commerce and Judiciary Committees on Capitol Hill in Washington on April 10, 2018, about the use of Facebook data to target American voters in the 2016 election.
Andrew Harnik
/ AP

“There is little incentive, whether it’s Facebook or Equifax, to actually be aggressive in protecting customer privacy,” said Hassan. “We’ve heard apologies but there is no financial incentive.” Zuckerberg said he’d look forward to a discussion of financial penalties, but he took issue with the idea that Facebook hasn’t felt pain.

“This episode has clearly hurt us,” he said.

While the company’s stock soared 4.5 percent Tuesday as Zuckerberg testified, its closing price of $165.04 per share was down from $193.09 on February 1.

In his relatively short time in the Senate, John Kennedy, R-La., has developed a reputation for delivering the best one-liners in the chamber. Though he had to wait four hours to question Zuckerberg Tuesday, he was ready with his quote machine. Here are the top 5 quotes from Kennedy.

1. "Your user agreement sucks."

2. "The purpose of that user agreement is to cover Facebook's rear end."

3. "I don’t want to regulate Facebook, but my God, I will."

4. "There are some impurities in the Facebook punch bowl."

5. And, he told the social network titan, "I feel like we’re not connecting."

Sen. Kamala Harris, D-CA, asks a very pointed question and doesn't let Zuckerberg dodge — did Facebook discuss notifying its users that their data had been taken by a researcher that worked Cambridge Analytica when the company found out about the data's misuse?

"Senator, in retrospect, we clearly view it as a mistake that we didn't inform people and we did that based on false information that the case was closed and the data had been deleted," Zuckerberg said.

Sen. Harris quickly interjected, "so, there was a decision made on that basis not to inform the users, is that correct?"

"That's my understanding, yes. And knowing what we know now, there's a lot of things we should have done differently," Zuckerberg said.

Sen. Gary Peters, D-MI, asks whether Facebook is listening to people's conversations through microphones in their smartphones. This is an amazing question because there is a group of people who fervently believe that Facebook is always listening to us and then using that information to target ads.

This has been a running conspiracy theory that Mark Zuckerberg has now responded to.

Zuckerberg says that the company does not.

And really, isn't it more impressive that Facebook can target ads so well that people think all their conversations are being listened to?

Zuckerberg told Sen. Heller, R-N.V., that Facebook does delete a user's data if they fully cancel their account. But he didn't know off the top of his head how long Facebook hangs out to a user's data before deleting it.

Facebook says it can take up to 90 days for the company to delete a user's data after they delete their account: "It may take up to 90 days from the beginning of the deletion process to delete all of the things you've posted, like your photos, status updates or other data stored in backup systems. While we are deleting this information, it is inaccessible to other people using Facebook."

To Senator Heller's question about how long user data remains on Facebook servers after you delete your account (which Zuck claimed not to know), Facebook says it can take up to 90 days https://t.co/fVr89XBFiH

Democratic senators have asked Zuckerberg time and again what he plans to do to make sure Facebook doesn’t get used to improperly influence elections, and he says that’s a top priority heading into the 2018 midterms in November.

He wants to make it “much harder in the future” for outside actors to impropoerly interfere in elections.But, he said, he can’t promises that images spread in 2016 won’t appear on Facebook again.

“I can’t guarantee that,” he said. “I don’t think it would be a realistic expectation … that we’re going to have zero amount of that and that we’re going to be 100 percent successful” at preventing it.

MSNBC's Kasie Hunt notes that it became pretty evident in the first half of the hearing that some of the questions asked by senators in their 60s and 70s don't quite understand the basics of Facebook technology, which has left Zuckerberg in a prime spot to fire back or divert.